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Sewer System Master Plan

Sewer System Master Plan. Council Presentation September 14, 2010. Clean Water Services. City Operates collection system (pipes up to 24”) Does utility billing Responsible for system integrity Provides for system extensions. CWS Provides treatment

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Sewer System Master Plan

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  1. Sewer System Master Plan Council Presentation September 14, 2010

  2. Clean Water Services • City • Operates collection system (pipes up to 24”) • Does utility billing • Responsible for system integrity • Provides for system extensions • CWS • Provides treatment • Owns and operates pipe over 24 inch and larger • Coordinates CIP • Sets maintenance standards • Sets technical standards • Sets the sewer service rates City - Local Services CWS – Regional Services

  3. Master Plan Scope • Clean Water Act Requirements • No overflows due to inadequate capacity • Assess capacity needs • Assess areas where rain water intrusion is high • Not covered • System preservation and replacement

  4. The Sewer System

  5. Capacity Findings • Capacity sites (City responsibility) • East Tigard Trunk • SW Katherine lateral • 128th avenue lateral • Shore Drive Trunk • Cost Estimate • 1.7 Million

  6. Capacity Finding CWS • CWS Projects • 72nd Avenue Lateral • Scholl Trunk • Metzger Interceptor • Elmwood Lateral • Cost Estimate: • $ 10.6 million

  7. East Tigard Trunk

  8. Shore Drive Project

  9. Rain Water Intrusion Areas

  10. Rainwater intrusion • Cost Estimate: • $2.0 million City • $2.0 million District

  11. System Preservation • System is aging • parts over 60 years old • System length • 873,000 feet (165 miles) • Replacement value in 2010 dollars • $90 million • Annual investment to replace over 50 years • $1.8 million

  12. 5 year Cost Estimate Summary

  13. Moving forward • Continue operations • System preservation analysis • Adopt the plan • CWS CIP Process • City CIP process • Project completion • System preservation

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